QUESTION 5 (a) A PMMC instrument with a f.s.d of 10µA and Rm = 10002 to be employed as a voltmeter with range of 10V, 50V and 100V. Calculate the required values of multiplier resistors for the circuits of Figure 5(a)-i and Figure Q5(a.ii). Ry R1 R S0V 10v 10V 50V 100V 100V (i) (ii) Figure Q5(a) (b) Two voltmeter are used to measure the voltage across the 50k2 resistor in the circuit shown in Figure QS(b). Meter A has ac sensitivity of 10k2V, a guaranteed accuracy of 97% at full scale, and is set on its 200V range. Meter B has an ac sensitivity of 4k2V, a guaranteed accuracy of 98% at full scale and is set on its 100V range. Which meter will provide a more accurate result?

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QUESTION 5
(a)
A PMMC instrument with a f.s.d of 10pA and Rm = 10002 to be employed as a
voltmeter with range of 10V, 50V and 100V. Calculate the required values of
multiplier resistors for the circuits of Figure 5(a)-i and Figure Q5(a.ii).
R3
R3
R1
R,
R R.
50V
10V
10V
50V
100V
100V
(i)
(ii)
Figure Q5(a)
(b)
Two voltmeter are used to measure the voltage across the 50kn resistor in the circuit
shown in Figure QS(b), Meter A has ac sensitivity of 10K2V, a guaranteed accuracy
of 97% at full scale, and is set on its 200V range. Meter B has an ac sensitivity of
4KNV, a guaranteed accuracy of 98% at full scale and is set on its 100V range. Which
meter will provide a more accurate result?
10k
R1
R 15k
V- 120Vrms
Ry 50k
Figure Q5(b)
Transcribed Image Text:QUESTION 5 (a) A PMMC instrument with a f.s.d of 10pA and Rm = 10002 to be employed as a voltmeter with range of 10V, 50V and 100V. Calculate the required values of multiplier resistors for the circuits of Figure 5(a)-i and Figure Q5(a.ii). R3 R3 R1 R, R R. 50V 10V 10V 50V 100V 100V (i) (ii) Figure Q5(a) (b) Two voltmeter are used to measure the voltage across the 50kn resistor in the circuit shown in Figure QS(b), Meter A has ac sensitivity of 10K2V, a guaranteed accuracy of 97% at full scale, and is set on its 200V range. Meter B has an ac sensitivity of 4KNV, a guaranteed accuracy of 98% at full scale and is set on its 100V range. Which meter will provide a more accurate result? 10k R1 R 15k V- 120Vrms Ry 50k Figure Q5(b)
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